Noah A. Waite-Brown, from Longview, died Sunday at the hospital while being treated for injuries he sustained April 14 in a two-vehicle, head-on collision near Clatskanie in Clatsop County, according a press release from the Oregon State Police.

Waite-Brown's death follows the passing of his father, Lucas William Brown, who was driving one of the vehicles. Brown died the day of the crash after arriving at a Portland-area hospital.

An investigation into the cause of the crash is ongoing.

According to OSP, at around 5:30 p.m. Brown was driving east with his two sons, Waite-Brown and 7-year-old Kane G. Brown when his car traveled across the road's center line and collided head-on with another vehicle.

Kane G. Brown sustained non life-threatening injuries.

The driver of the other car, Kimberly Anne Sultan, 42, from Astoria, is still in serious condition. Sultan's passengers -- Ivan Sultan, age 44; Keanu Sultan, age 16; and Emily R. Lloyd, age 22 months -- were treated for minor injuries.